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elements: Added small helper to compute the right signature hash

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Depending on the network we end up with different signature hash algorithms,
so we just collect that decision in one place.

Signed-off-by: Christian Decker <decker.christian@gmail.com>
This commit is contained in:
Christian Decker 2019-05-06 15:13:50 +02:00 committed by Rusty Russell
parent 3963b0040e
commit f0396df449
1 changed files with 29 additions and 10 deletions
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39
bitcoin/signature.c
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@ -88,6 +88,32 @@ void sign_hash(const struct privkey *privkey,
assert(ok);
}
static void bitcoin_tx_hash_for_sig(const struct bitcoin_tx *tx, unsigned int in,
const u8 *script,
enum sighash_type sighash_type,
struct sha256_double *dest)
{
int ret;
u8 value[9];
u64 satoshis = tx->input_amounts[in]->satoshis /* Raw: sig-helper */;
int flags = WALLY_TX_FLAG_USE_WITNESS;
if (is_elements) {
ret = wally_tx_confidential_value_from_satoshi(satoshis, value, sizeof(value));
assert(ret == WALLY_OK);
ret = wally_tx_get_elements_signature_hash(
tx->wtx, in, script, tal_bytelen(script), value,
sizeof(value), sighash_type, flags, dest->sha.u.u8,
sizeof(*dest));
assert(ret == WALLY_OK);
} else {
ret = wally_tx_get_btc_signature_hash(
tx->wtx, in, script, tal_bytelen(script), satoshis,
sighash_type, flags, dest->sha.u.u8, sizeof(*dest));
assert(ret == WALLY_OK);
}
}
void sign_tx_input(const struct bitcoin_tx *tx,
unsigned int in,
const u8 *subscript,
@ -98,16 +124,12 @@ void sign_tx_input(const struct bitcoin_tx *tx,
{
struct sha256_double hash;
bool use_segwit = witness_script != NULL;
int flags = use_segwit ? WALLY_TX_FLAG_USE_WITNESS : 0;
const u8 *script = use_segwit ? witness_script : subscript;
assert(sighash_type_valid(sighash_type));
sig->sighash_type = sighash_type;
wally_tx_get_btc_signature_hash(
tx->wtx, in, script, tal_bytelen(script),
tx->input_amounts[in]->satoshis /* Raw: low-level helper */,
sighash_type, flags, hash.sha.u.u8, sizeof(hash));
bitcoin_tx_hash_for_sig(tx, in, script, sighash_type, &hash);
dump_tx("Signing", tx, in, subscript, key, &hash);
sign_hash(privkey, &hash, &sig->s);
@ -133,7 +155,6 @@ bool check_tx_sig(const struct bitcoin_tx *tx, size_t input_num,
{
struct sha256_double hash;
bool use_segwit = witness_script != NULL;
int flags = use_segwit ? WALLY_TX_FLAG_USE_WITNESS : 0;
const u8 *script = use_segwit ? witness_script : redeemscript;
bool ret;
@ -146,10 +167,8 @@ bool check_tx_sig(const struct bitcoin_tx *tx, size_t input_num,
}
assert(input_num < tx->wtx->num_inputs);
wally_tx_get_btc_signature_hash(
tx->wtx, input_num, script, tal_bytelen(script),
tx->input_amounts[input_num]->satoshis /* Raw: low-level helper */,
sig->sighash_type, flags, hash.sha.u.u8, sizeof(hash));
dump_tx("check_tx_sig", tx, input_num, script, key, &hash);
bitcoin_tx_hash_for_sig(tx, input_num, script, sig->sighash_type, &hash);
ret = check_signed_hash(&hash, &sig->s, key);
if (!ret)